dream- crocodiles?

i have previously had a few dreams about crocodiles. i remember the first ones where i was scared of them and tried to kill them. the next ones were me overcoming my fear of them and realising they werent trying to get me. these dreams have occured sporadically over the last few years. last night i had a dream where i was renovating a house, which was on the street that i used to live on as a child, and i went out to the back yard and found under the dirt some half buried small rectangular shapes wrapped in plastic. at first i didnt realise what they were jut thought they were rubbish. when i kept finding more i had a closer look and they were small crocodiles. i dont remember how i felt at this point in my dream, a little sad i think. i kept walking around the house and found a larger one, this time i knew what it was straight away. i dragged it out into the middle of the yard and ripped a hole in the plastic and pulled it back around the crocodile who was laying on its back then i ran back under the house to watch. after a secod or two it started taking these massive big breaths and i could see its chest area swelling up with breath. i then went back upstairs and after a while i went down again to check on the croc and it had gone.

i would like to know what is the meaning of the crocodile in dreams as it is something that i guess i dream about over and over. also, what do you think this particular dream is and is there a reason for the different types of dreams i am having all about crocodiles but slightly different. thanks